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Go to wp console, then click to Accessibility spring in sidebar and enable options that you need to start to work.

Change font size

Mudar Tamanho da Fonte

Scale page^beta

Mudar Tamanho da Página

Grayscale

Tons de Cinza

Sepia

Sépia

High contrast

Alto Contraste

Invert color

Inverter Cores

Contrast cursor

Contraste no Cursor

Highlight links

Destacar Links

ALUNO